Nice efforts towards bringing in frequently used tools together.
Played a bit with it. Suggest you to make it more useful by:
1. Support single quotes also in json
2. Better error reporting; Just saying invalid json is not enough.
3. Auto correct functionality
4. Few more tools like guid generator, etc
Thanks for the feedback!
1. Added support of single quotes for JSON
2. And made some improvements in error reporting. It says now position of first invalid character.
Set of online text tools useful for web development.